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The Global Ranking of the Publishing Industry, which has been updated every year since 2007, currently represents 57 companies that each report revenues from publishing of over 150 m€ (or 200 m US$).
The overall number of listed companies has shown a fluctuation between slightly over 50 to up to 60. (As a consequence, a few historic observations in the analysis here below refer only to the top 50 companies, to allow more relevant comparisons.)
This ranking is based, for each company, on mostly 2014 revenue data, collected from the best information available, which comes predominantly either from official company reports, or has been directly provided by the companies for this report, or if neither was possible, information has been retrieved from official company data registries.